Coated nail



Patented July 1, 1947 COATED NAIL Willis E. Boak, Burton, Ohio, assignorto The American Steel and Wire Company of New Jersey, a corporation ofNew Jersey No Drawing. Application February 3, 1944, Serial No. 520,930

1 Claim. 1

This invention relates to coated nails of the type having coatings forthe purpose of enhancing their frictional resistance to withdrawal afterbeing hammered into wood.

According to the present invention, a coating material is made upconsisting by weight of 70 parts fine melt Congo resin, 30 parts rungilsonite, from 2 to 20 parts of a plasticizer, 20 parts xylol and 120parts V. M. 8: P. naphtha.

Upon mixing the constituents, the resultant liquid may be used to coatnails in the same fashion as nails have been heretofore coated. Afterdrying, during which the xylol and naphtha evaporate, the resultantproduct is nails having coatings consisting by weight of 70 parts finemelt Congo resin, 30 parts run gilsonite and from 2 to 20 parts of aplasticizer.

The coating on these nails will flow under impact, such as when a blowis applied on the head of the coated nail, thus enabling the coating tocement the nail in its socket in the wood or other material into whichit is driven. The coating has sufficient adhesion and elasticity so thatit is not readily knocked off during handlin and shipping. After thecoating operation the coating air dries rapidly which insures againstthe nails forming masses in the kegs. The coating has an attractiveappearance and furnishes considerable protection against rusting. Thecoating is not injurious to health if the nails are held in the mouth.The resistance to pulling out driven coated nails is very high for thiscoating, being 200% or more above the average of bare nails. If thecoated nails are given the rattle test, wherein the nails are rattledabout to simulate shipping conditions, the nails will thereafter havealmost as high a pull resistance as do the coated nails that have notbeen given the test. In addition to all this,

2 all of the constituents of the coating are at present available.

\ In making up the liquid mixture, the Congo resin and gilsonite are putinto solution either by cold cutting or by heating to about 250 F. inthe presence of the xylol, and after the latter is taken up, thedescribed naphtha is worked in.

After the resins are all in solution the plasticizer is stirred in. Ifthe Congo resin is carried to a slack melt, if the gilsonite is run muchbeyond the point where it becomes soluble, or if the Congo and gilsoniteresins are melted together before adding the solvent, the resultantcoating is too brittle. The placticizer used may be either a semi-dryingor slow drying oil such as soya bean oil or refined fish oil.

I claim:

A metal fastening of the typ that is hammered into wood and frictionallyretained therein, having a coating consisting by weight of about partsfine melt Congo resin, 30 parts run gilsonite and from 2 to 20 partsplasticizer.

WILLIS E. BOAK.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date Re. 17,379 Ellis July 23, 1929686,654 Henderson Nov. 12, 1901 773,524 Rogers Oct. 25, 1904 2,071,685Ellsworth 1------" Feb. 23, 1937 2,162,177 Laufer June 13, 19392,181,352 Thompson Nov. 28, 1939 362,940 Copeland May 17, 1887 2,047,889Roskosky July 14, 1936

